Walkie-pen regular BP Silver P

I love this pen! It is even smaller than you might expect, which makes it fit extremely well into a wallet. The cartridge is a Pilot BRF-8F 0.7mm Ball Pen Refill, which writes nicely, is easily replaceable, and I do not fear it leaking in my wallet since it is a widely used brand.

Good size for my wallet

It's 5.8" long in package and the pen itself is 8.2mm in length. It fits nicely in my wallet.

This small pen clips neatly into my wallet. In a hot climate, when you don't wear a jacket, it never works to keep a standard sized pen in your shirt pocket or trouser pocket. Even so you have to remember to take that pen with you. You clip this little pen neatly into your wallet. You leave it there permanently and so you don't have to remember to take it with you. I have two wallets and two pens.